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Linux is really only a thing because it ISNT Unix (which macos is). Theyre more related than windows because they’re both POSIX compatible, but share essentially no codebase.
A rooted android phone on the other hand is just plain ol linux compiled for ARM, with some custom google jazz. It utilises a lot of Linux components like cgroups and SELinux - commonly found on desktop Linux (especially with containers).
Its not really that important in a broad sense to be honest, but it definitely makes android a Linux distro.
Or we could just like shield radiation, and provide oxygen/gravity.
Relying on evolution for this sounds like it’d take a couple millennium longer than just like a spinning slab of concrete with a rebreather inside.